Uplink Power Control in NR Decoupled Scenarios
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Solution Overview
Problem
In uplink and downlink decoupling scenarios of New Radio (NR) technology, the difference in path losses between uplink and downlink transmissions makes it challenging for user equipment (UE) to perform accurate uplink power control using downlink measurements.
Innovation Solution
The proposed method involves a base station sending reference signals to a terminal, allowing the terminal to measure the path loss and calculate its uplink transmit power based on the received signals and predefined thresholds, even in scenarios where downlink and uplink frequencies differ significantly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If downlink path loss is used as uplink path loss to obtain uplink transmit power, then the method is simple and can be implemented, but the accuracy deteriorates significantly in uplink and downlink decoupling scenarios due to large frequency differences
Solution Approach 1:
The patent segments the power control process into two distinct parts: downlink path loss measurement (for coverage assessment) and uplink path loss estimation (for actual power control). By separating these functions and using different frequency carriers for each, the system maintains simplicity in measurement while improving accuracy in power determination for decoupled scenarios.
Solution Approach 2:
The patent introduces an intermediary frequency relationship parameter that acts as a bridge between downlink and uplink path losses. This intermediary parameter allows the system to transfer path loss information across frequency boundaries, enabling accurate uplink power control even when downlink and uplink operate on significantly different frequencies.
2Measurement precision
If uplink and downlink use the same frequency carrier, then path loss measurement is accurate and simple, but the system cannot support uplink and downlink decoupling scenarios
Solution Approach 1:
The patent creates a universal path loss estimation method that works in both coupled and decoupled scenarios. By establishing a frequency relationship parameter that can adapt to different frequency configurations, the system maintains measurement accuracy whether uplink and downlink use the same carrier or different carriers, thus achieving multi-functionality.
Solution Approach 2:
The patent dynamically adjusts the frequency relationship parameter based on the operational scenario. When decoupling is detected, the system changes the parameter to account for frequency differences, allowing accurate path loss estimation across varying frequency configurations without requiring separate methods for each scenario.
3Reliability
If frequency difference between uplink and downlink carriers is increased to enable decoupling, then coverage difference is reduced, but path loss difference increases making power control difficult
Solution Approach 1:
The frequency relationship parameter serves as an intermediary that compensates for the path loss difference caused by large frequency gaps. This parameter enables the system to maintain reliable coverage balance through decoupling while correcting for the measurement inaccuracies that would otherwise result from the frequency difference.
Solution Approach 2:
The system changes the path loss estimation parameters based on the frequency relationship between uplink and downlink carriers. By adjusting these parameters according to the frequency gap, the system maintains measurement precision even when large frequency differences are used to achieve coverage balance through decoupling.
Data Source
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AI summary
Embodiments of this application provide an uplink control method, apparatus, and system. The method includes: determining a downlink path loss based on a first reference signal receive power that is of a serving cell in which the terminal device is located and that is obtained through measurement, where the first reference signal is a signal of a first network; receiving a first transmit power and a second transmit power that are sent by the base station, where the first transmit power includes an uplink transmit power of the terminal expected by the base station and a path loss offset, and the second transmit power includes the uplink transmit power of the terminal expected by the base station, the path loss offset, and a penetration loss offset; and if the first reference signal receive power is greater than or equal to a preset threshold, obtaining, by the terminal, an uplink transmit power of the terminal in the first network based on the first transmit power; or if the first reference signal receive power is less than a preset threshold, obtaining, by the terminal, an uplink transmit power of the terminal in the first network based on the second transmit power. In this application, the uplink transmit power of the terminal in the uplink and downlink decoupling scenario is obtained by using the foregoing method.